100 Watt RMS Amplifier: This is a100-Watt basic power amp that was designed to be (relatively) easy to build at a reasonable cost. It has better performance (read: musical quality) than the standard STK module amps that are used in practically every mass market stereo receiver manufactured today. When I originally built this thing, it was because I needed a100 WPC amp and didnt want to spend any money. So I designed around parts I had in the shop.

Balanced Low Noise Microphone Preamp: very low noise, close to the theoretical minimum, high hum rejection and variable gain with a single rotary pot, similar to that used in many professional grade mixing desks

Class D Audio Power Amplifiers: 01/04/01 EDN-Design Ideas / Class D amplifiers are much more efficient than other Classical amplifiers, but their high efficiency comes at the expense of increased noise and distortion. You can assess the frequency- and Time-domain characteristics of a Class D amplifier, including the output filter, using online simulations.

Hi Fi Class D Audio Power Amplifier: The purpose of this site is to share a pulse-width modulating Class D audio power amplifier design with the world, in order to involve people that have an interest in this kind of technology. This is in effect an "open source project", i.e. the design is open and free, and those that have the interest and ability, are encouraged to feed back back into the project.

Low Noise Balanced Microphone Preamp: very low noise, close to the theoretical minimum, high hum rejection and variable gain with a single rotary pot, similar to that used in many professional grade mixing desks